<template>
  <div>
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>商品分类</el-breadcrumb-item>
    </el-breadcrumb>
    <el-card>
      <el-row>
        <el-col>
          <el-button type="primary" @click="showAddDialog">添加分类</el-button>
        </el-col>
      </el-row>

      <!-- 表格 -->
      <tree-table class="tree-table" :data="cateList" :columns="columns" border :selection-type="false"
        :expand-type="false" show-index index-text="#">
        <template slot="isok" slot-scope="scope">
          <i v-if="scope.row.cat_deleted == false" class="el-icon-success" style="color:lightgreen"></i>
          <i v-else class="el-icon-error" style="color:red"></i>
        </template>
        <template slot="order" slot-scope="scope">
          <el-tag size="mini" v-if="scope.row.cat_level == 0">一级</el-tag>
          <el-tag size="mini" v-else-if="scope.row.cat_level == 1" type="success">二级</el-tag>
          <el-tag size="mini" v-else type="warning">三级</el-tag>
        </template>
        <template slot="opt" slot-scope="scope">
          <el-button size="mini" type="primary" icon="el-icon-edit">编辑</el-button>
          <el-button size="mini" type="danger" icon="el-icon-setting">删除</el-button>
        </template>
      </tree-table>

      <!-- 分页区域 -->
      <el-pagination @size-change="handleSizeChange" @current-change="handleCurrentChange"
        :current-page="this.queryInfo.pagenum" :page-sizes="[3, 5, 10, 15]" :page-size="this.queryInfo.pagesize"
        layout="total, sizes, prev, pager, next, jumper" :total="total">
      </el-pagination>
    </el-card>
    <!-- 添加分类对话框区域 -->
    <el-dialog title="添加分类" :visible.sync="addCateDialogVisible" width="50%" :before-close="handleClose"
      @close="addCateDialogClosed">
      <!-- 添加分类的表单 -->
      <el-form :model="addCateForm" :rules="addCateFromRules" ref="addCateFormRef" label-width="100px"
        class="demo-ruleForm">
        <el-form-item label="分类名称" prop="cat_name">
          <el-input v-model="addCateForm.cat_name"></el-input>
        </el-form-item>
        <!-- 父类选择的表单 -->
        <el-form-item label="父级分类">
          <!-- options来展示数据源 -->
          <el-cascader v-model="selectedkeys" :options="addParentsCateList" :props="cascaderProps" :change-on-select="true"
            expandTrigger="hover" @change="ParentsCataChange" clearable></el-cascader>
        </el-form-item>
      </el-form>

      <span slot="footer" class="dialog-footer">
        <el-button @click="addCateDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addCate">确 定</el-button>
      </span>
    </el-dialog>

  </div>
</template>

<script>
export default {
  data() {
    return {
      // 商品分类的列表
      cateList: [],
      total: 0,
      addParentsCateList: [],
      queryInfo: {
        type: 3,
        pagenum: 1,
        pagesize: 5,
      },
      columns: [
        {
          label: '分类名称',
          prop: 'cat_name'
        },
        {
          label: '是否有效',
          type: 'template',
          template: 'isok',
        },
        {
          label: '排序',
          type: 'template',
          template: 'order',
        },
        {
          label: '操作',
          type: 'template',
          template: 'opt',
        },

      ],
      addCateDialogVisible: false,
      addCateForm: {
        cat_name: '',
        cat_pid: 0,
        // 分类等级添加默认为一级
        cat_level: 0

      },
      addCateFromRules: {
        cat_name: [
          { required: true, message: '请输入用户对象', trigger: 'blur' },

        ]
      },
      cascaderProps: {
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      selectedkeys: []

    }
  },
  created() {
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories', { params: this.queryInfo })
      if (res.meta.status !== 200) return this.$message.error('请求商品数据失败')

      this.cateList = res.data.result
      // console.log(this.cateList[0].cat_name);
      this.total = res.data.total
    },
    handleSizeChange(newsize) {
      this.queryInfo.pagesize = newsize
      this.getCateList()
    },
    handleCurrentChange(newpage) {
      this.queryInfo.pagenum = newpage
      this.getCateList()
    },
    showAddDialog() {

      this.getParentCateList()
      this.addCateDialogVisible = true
    },
    // 获取父级分类的数据列表
    async getParentCateList() {
      const { data: res } = await this.$http.get('categories', { params: { type: 2 } })
      if (res.meta.status !== 200) return this.$message.error('获取父级分类列表失败')
      // console.log(res.data);
      this.addParentsCateList = res.data
    },
    ParentsCataChange() {
      console.log(this.selectedkeys);
      // 如果selectedkeys的长度大于0，则选中了父分类
      // 如果长度为0，默认选择一级分类
      if (this.selectedkeys.length > 0) {
        this.addCateForm.cat_pid = this.selectedkeys[this.selectedkeys.length - 1]
        this.addCateForm.cat_level = this.selectedkeys.length
        return
      } else {
        this.addCateForm.cat_pid = 0
        this.addCateForm.cat_level = 0
      }
    },
    addCate() {
      this.$refs.addCateFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post('categories', this.addCateForm)
        if (res.meta.status !== 201) return this.$message.error("添加分类失败")
        this.$message.success('添加分类成功')
        this.getCateList()
        this.addCateDialogVisible = false

      })
    },
    addCateDialogClosed() {
      this.$refs.addCateFormRef.resetFields()
      this.selectedkeys = []
      this.cateList.cat_level = 0
      this.cateList.cat_pid = 0
    }

  }

}
</script>

<style lang="less" scoped>
.tree-table {
  margin-top: 15px;
}

.el-cascader {
  width: 100%;
}
</style>